Open Access Highly Accessed Research article

The role of MMP-1 in breast cancer growth and metastasis to the brain in a xenograft model

Hui Liu1*, Yukinari Kato1, Stephanie A Erzinger1, Galina M Kiriakova1, Yongzhen Qian2, Diane Palmieri2, Patricia S Steeg2 and Janet E Price1*

Author Affiliations

1 Department of Cancer Biology, The University of Texas, M. D. Anderson Cancer Center, Houston, TX, 77030, USA

2 Women’s Cancers Section, Laboratory of Molecular Pharmacology, National Cancer Institute, Bethesda, MD, 20892, USA

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BMC Cancer 2012, 12:583  doi:10.1186/1471-2407-12-583

Published: 7 December 2012

Additional files

Additional file 1:

Parental MDA-MB-231, BR3, BR and shRNA transfected variant cells were seeded in 96-well plates (100 μl/well) at a concentration of 1×106 cells/ml and cultured at 37ºC, 5% CO2 in MEM medium. For time-dependent assays, cells were incubated for 24 h, 48 h and 72 h. Cell viability was analyzed using MTT (3 (4, 5-dimethylthiazol-2yl)-2, 5-diphenyltetrazolium bromide). Statistical comparison by Student’s t-test is expressed as p > 0.05 for both BR and BR3 groups.

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Additional file 2:

Parental MDA-MB-231, BR3, BR and shRNA transfected variant cells were injected into mammary fat pads of nude mice at an inoculum of 5X106 cells/0.1 ml. After 7 weeks, mice were sacrificed and tumor formation was compared. Statistical comparison by Fisher’s exact test is expressed as p > 0.05 for both BR and BR3 groups.

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Additional file 3:

Ki-67 staining was performed on sections of breast tumor induced by mammary fat pad injection of BR and BR3 control cells and MMP-1 knockdown cells. A, representative staining images and B, quantification of Ki-67 staining.

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Additional file 4:

Real-time PCR quantification of TGFα and EGFR mRNA levels of control cells (shCtr and shNTC) and MMP-1 knockdown cells (sh1 and sh1a, sh1b) in BR3 and BR cells.

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